<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    <script type="text/javascript" src="../js/jquery-3.3.1.min.js"></script>
</head>
<script>
    function hideFn() {
        $("#showDiv").hide("slow","swing",function () {
            alert("隐藏")
        })
    }
    function showFn() {
        $("#showDiv").show("slow","swing",function () {
            alert("显示了")
        })
    }
    function toggleFn() {
        // $("#showDiv").toggle("slow","swing")
        $("#showDiv").slideToggle("slow")
    }
</script>
<body>
<input type="button" value="点击按钮隐藏div" onclick="hideFn()">
<input type="button" value="点击按钮显示div" onclick="showFn()">
<input type="button" value="点击按钮切换div显示和隐藏" onclick="toggleFn()">

<div id="showDiv" style="width:300px;height:300px;background:pink">
    div显示和隐藏
</div>
</body>
</html>
